It's built on Rust with GPUI, leveraging the high-performance rendering engine that powers Zed editor, now on mobile with Zedra. The connection is peer-to-peer using outbound-only networking, on QUIC/UDP, working on home networks, without port forwarding.
After 4 months of intensive work, Zedra is now ready to try on iOS/Android, CLI supports Mac/Linux/Windows.